现有①~④四个纯种果蝇品系,品系①的性状均为显性,品系②~④均只有一种性状是隐性,其他性状均为显性。这四个品系的隐性性状及控制该隐性性状的基因所在的染色体如下表所示: 品系①②③④ 隐性性状-残翅黑身紫红眼 相应染色体Ⅱ、ⅢⅡⅡⅢ 若需验证自由组合定律,可选择交配的品系组合为 A.①×④ B.①×② C.②×③ D.②×④ human nose is under – rated tool. In other words, we are better smellers than we think we are . A.A; a B.The ; the C.The; a D.The; an